Exam 29: The Working Plant

Early in the spring, cherry trees produce flowers, even before their leaves develop, by using sugars that were stored in their roots the previous year. While cherry flowers are developing, we would expect the phloem pressure near flowers to be ________, and ________ near root storage cells.

Trace the flow of a water molecule that is used during photosynthesis, from the environment to the site of photosynthesis.

What best describes the mechanism that causes stomata to open?

Which hormone promotes fruit ripening and dropping of leaves?

Plant transport products have many economic uses. A product that is correctly paired to its plant structure is ________.

For plants, mycorrhizae are ________.

Most plants rely on bacteria to supply them with a usable form of ________.

What processes contribute directly to soil nitrate concentrations?

-In the figure, for water to flow from Site B to the adjacent xylem ________.

-In the figure, for sugar to move from the source cell (Label 1)into the phloem (Label 2)________.

What best describes night-neutral plants?

What moves phloem sap within a plant?

Three very popular strawberry cultivars grown by farmers in the United States are Earliglow, Ozark Beauty, and Tristar. Earliglow produces all of its fruit in the early summer, before days become very long (June-bearing). Ozark Beauty produces fruit from mid to late summer (everbearing). Tristar produces fruit all summer long, starting when conditions become favorable for flowering and fruit production. What is the best classification for these three strawberry cultivars?

Scenario In the late 1800s, Charles Darwin and his son Francis conducted the first experiments on phototropism. Several years later, their work was furthered by Peter Boysen-Jensen, Arpad Paal, and Frits Went. Peter Boysen-Jensen separated the tip of grass shoots from the rest of the plant using either tiny blocks of agar (a gelatin)or a mica wafer (an impervious rock). Like the Darwins, Boysen-Jensen noticed that the grass did not grow toward a light without its tips. However, when he separated the tip from the rest of the plant using agar, the grass would grow toward a light. The grass would not grow toward a light if the tip of the shoot was separated using a mica wafer. Arpad Paal cut off the tips of grass shoots that were growing in the dark. He placed these cut tips back on the shoots, but with only part of the tip covering the cut surface, and found that the plants grew, in the dark, in the opposite direction from the side with the tip covering it. Lastly, Frits Went removed the tips of many grass shoots and placed them on a large block of agar for a few hours. Then, he cut up the agar block, and was able to make grass shoots without any tips at all grow toward a light by putting these agar blocks on the cut surfaces of the shoots (i.e., no tips were placed back on the shoots, only the agar). -If Wents placed his agar blocks only halfway on the cut surfaces of grass shoots with their tips removed, what should he have observed?

Experimental plants that were sent up in space shuttle missions did not exhibit all of their normal tropisms. Which response would you most expect to be lacking from these plants?

What does a plant gain from a mycorrhizal relationship?

What is the conversion that occurs during nitrogen fixation?

-What kind of plant response is represented by the bending of the shoot in this figure?

-What can regulate the rate of water movement upward as shown in the figure?

What best describe(s)the dependencies of most flowering plants?